CVE-2020-9484 Information

Description

When using Apache Tomcat versions 10.0.0-M1 to 10.0.0-M4 9.0.0.M1 to 9.0.34 8.5.0 to 8.5.54 and 7.0.0 to 7.0.103 if a) an attacker is able to control the contents and name of a file on the server; and b) the server is configured to use the PersistenceManager with a FileStore; and c) the PersistenceManager is configured with sessionAttributeValueClassNameFilter=\null\ (the default unless a SecurityManager is used) or a sufficiently lax filter to allow the attacker provided object to be deserialized; and d) the attacker knows the relative file path from the storage location used by FileStore to the file the attacker has control over; then using a specifically crafted request the attacker will be able to trigger remote code execution via deserialization of the file under their control. Note that all of conditions a) to d) must be true for the attack to succeed.

CVSS Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00057.html http://packetstormsecurity.com/files/157924/Apache-Tomcat-CVE-2020-9484-Proof-Of-Concept.html http://seclists.org/fulldisclosure/2020/Jun/6 https://kc.mcafee.com/corporate/index?page=content&id=SB10332 https://lists.apache.org/thread.html/r123b3ebe389f46f9d337923f393cdae4d3e9b78d982d706712f0898c@3Ccommits.tomee.apache.org3E https://lists.apache.org/thread.html/r26950738f4b4ca2d256597cf391d52d3450fa665c297ea5ca38f5469@3Cusers.tomcat.apache.org3E https://lists.apache.org/thread.html/r77eae567ed829da9012cadb29af17f2df8fa23bf66faf88229857bb1403Cannounce.tomcat.apache.org3E https://lists.apache.org/thread.html/r7bc247fffcb1d58415215c861d2354bd653c86266230d78a93c71ae2@3Cdev.tomcat.apache.org3E https://lists.apache.org/thread.html/raa4123e472175bb052fbba165d37187cea923f755e8f3f30d124cb3f@3Ccommits.tomee.apache.org3E https://lists.apache.org/thread.html/rb1c0fb105ce2b93b7ec6fc1b77dd208022621a91c12d1f580813cfed@3Cdev.tomcat.apache.org3E https://lists.apache.org/thread.html/rc8473b08abdf3c16494ed817bec1717a0ee0c8080315bc27db5f21c3@3Ccommits.tomee.apache.org3E https://lists.apache.org/thread.html/rf59c72572b9fee674a5d5cc6afeca4ffc3918a02c354a81cc50b7119@3Ccommits.tomee.apache.org3E https://lists.apache.org/thread.html/rf70f53af27e04869bdac18b1fc14a3ee529e59eb12292c8791a77926@3Cusers.tomcat.apache.org3E https://lists.debian.org/debian-lts-announce/2020/05/msg00020.html https://lists.debian.org/debian-lts-announce/2020/05/msg00026.html https://lists.debian.org/debian-lts-announce/2020/07/msg00010.html https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GIQHXENTLYUNOES4LXVNJ2NCUQQRF5VJ/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WJ7XHKWJWDNWXUJH6UB7CLIW4TWOZ26N/ https://security.gentoo.org/glsa/202006-21 https://security.netapp.com/advisory/ntap-20200528-0005/ https://usn.ubuntu.com/4448-1/ https://usn.ubuntu.com/4596-1/ https://www.debian.org/security/2020/dsa-4727 https://www.oracle.com/security-alerts/cpujul2020.html https://www.oracle.com/security-alerts/cpuoct2020.html

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.0